function New-Session {
    [CmdletBinding(DefaultParameterSetName="Credentials")]
    param (
        [parameter(Mandatory=$true,ValueFromPipeline=$true,ValueFromPipelineByPropertyName=$true,Position=0)]
        [ValidateNotNullOrEmpty()]
        [validatescript({$_.startswith("http")})]
        [string]$URL,
        [parameter(Mandatory=$true,ValueFromPipeline=$true,ValueFromPipelineByPropertyName=$true,Position=1)]
        [ValidateNotNullOrEmpty()]
        [string]$AppID,
        [parameter(Mandatory=$true,ValueFromPipeline=$true,ValueFromPipelineByPropertyName=$true,Position=2,ParameterSetName="Credentials")]
        [ValidateNotNullOrEmpty()]
        [pscredential]$Credentials,
        [parameter(Mandatory=$true,ValueFromPipeline=$true,ValueFromPipelineByPropertyName=$true,Position=2,ParameterSetName="Token")]
        [ValidateNotNullOrEmpty()]
        [string]$Token,
        [parameter(Mandatory=$false,ValueFromPipeline=$true,ValueFromPipelineByPropertyName=$true,Position=3)]
        [switch]$IgnoreSSL = $false
    )
    switch ($PSCmdlet.ParameterSetName) {
        "Credentials" {
            $_bstr          = [System.Runtime.InteropServices.Marshal]::SecureStringToBSTR($Credentials.Password)
            $_password      = [System.Runtime.InteropServices.Marshal]::PtrToStringBSTR($_bstr)
            $_uri           = "$URL/api/$AppID/user"
            $_auth          = [System.Convert]::ToBase64String([System.Text.Encoding]::UTF8.GetBytes("$($Credentials.UserName):$_password")) 
            $_headers  = @{
                "Accept"        = "application/json"
                "Content-Type"  = "application/json"
                "Authorization" = "Basic $_auth"
            }
        
            $_response  = Invoke-RestMethod -Method POST -Uri $_uri -Headers $_headers

            if ($_response.success -ne $true) { return $_response.error }

            $script:psipamSession = [PS.IPAM.Session]::new(
                [ps.ipam.authType]::credentials,
                $_response.data.token,
                $AppID,
                $URL,
                (Get-Date $_response.data.expires),
                $Credentials
            )
            break
        }
        "Token" {
            $script:psipamSession = [PS.IPAM.Session]::new(
                [ps.ipam.authType]::token,
                $Token,
                $AppID,
                $URL,
                $null,
                $null
            )
            break
        }
    }
}
Export-ModuleMember -Function New-Session